I would think that a fissure (even a microscopic one) could develop between the UT & the DT. I also have heard that CD can affect the liver and kidneys (not sure how). I have never heard of anyone having it there, and I would hope that the natural ph of the area wouldn't be hospitable to it, but if this is a legitimate question, my "guess" is that it's theoretically possible, but practically impossible. Or at least I hope so too!